Abstract: The construction of highway tunnel engineering in our country is not only related to people's livelihood, but also a key project of economic development and social reform in our country. At present, my country’s road network is relatively complete. The complex road network contains roads or tunnels of different levels. The areas where these roads and tunnels are located may be mountainous, flat ground and other terrain. Some terrain, climate and geographical environment may affect road tunnels. Cause certain harm and cause cracks, so the quality control of highway engineering is very important. Based on this, this article expounds the types of road tunnel cracks, analyzes the specific causes of cracks and prevention strategies for reference.